US1815937A - Underreamer - Google Patents

Description

Jul 28, 1931.

F. SWAN 1,815,937

UNDERREAMER Filed Jan. 8. 1929 IN VE N T OR DZ ATTORNEY 3 Sheets-Sheet l July 28, 1931. F. SWA1V 1,815,937

- 7 I I UNDERREAMER I v Filed Jan. 8, 1929 {sweets-sheet 2 v INVENTOR Y F g 511. 10 .42 1 2111 A TTOR/VEY July 28, 1931. F, SWAN 1,815,937

UNDERREAMER 3 Sheets-Sheet 3 Filed Jan. a, 1929 mug/A M j;

15 end of Whic Patented July 28 1931 V L FRED swim, oewxcrirm, Kansas, 'ASSIGNQR arc-THE BRIDGE-roar MACHI E corn PANY, 61 wIoHITA, :KA-NsAs, VA CORPQ-BATION OFVDELAVWARE" i UNIDERREAMER f 1 ap ease filed was s, 19 2e.f se;ia1no. 331,140.

This inventionrelates to underreamers and the 'primary 'ob 'ect thereof s to provide an efiioient simple construction of underreamer in vvhic'h expandingiand contracting cutters 5 can he ex editiously applied to the stock or head and easilyreinoved, when it is necessary tore pair or" redressthem.,, The cutters are Tadaptedtorideupon an expander d e to a spring responsive actuating rod which is'con nected to'the reins of thecutters hya crosshar ot novel-construction V, The crosssbar is animportan't feature of the invention because it, permits. convenient removal of the cutters vvhenever it is" necessary to repair or redress t em a itfllso p-efmitsithereins torbe 0P9? gme q i t d with the a t ng ed. iWheH,filmyihit h ii m i he head v o y I 711311 arms or'rein's,1 'a 1 1 1 at l or stock;

"The e bf; the "inven ion will he rap- 1 -g kp ren y" r ere e I th T QII ed i P-o ti qn inj connection withfthe accompanying adrawmgsin whichi F'g: 1' s: an ele at o View 31nd, finder? f' inventioni". 5 A o e,

2 is, a sectional viewthroughparto'f a Fig.

Welt casing showing the head or; stock, the

,-o actuating rod, the c'iitters and egrpander, parts being in elevati'omparts. insectli'on and certain 3 ofithe parts-being broken aWay'to better illuswe certain other parts' the cutters being shown as in contracted positions.

, .i Figb -xifs a likeview showing the critters .linexpanded pesitions.'-

1 .35 1F'i'g Aisa} detailed perspectivevievv'of one cithhritters. I o e ;;-Ei'g '5 isxan endviewot thefnnderreamer.

1g. 6is anenla-rged vi wer the cross-bar.

,Figfl is ahottom vievviof the cross-har V '40 fFiglS is anenlargedcI'QssQseCtiOIIaI vievv I 1 Reterringnovv tothe' drawingsbyjnomera Figf 10 is a perspective view o'f of referencegll d'esignatesfthe; oil wy'ell' casing, Qisthe head r-stockQprovidedfvv thja shank o ifhavifig s nag harrelorr'ecess 4 :the lmyer e m-em 1 reameroonstrutedainaccordance with my fljhe ends er the 'crosspar are beveled 29 and. to prcvict phcts fie assist I a seat forone end of the/coil spring 6,the

opposite end bearing against the enlargement or head 7 of the cutter actuated rod 8 also in the recess 4:. The lower end of the rod 8 projectsbelow the seat and hasa slotted head or loop 9 to receivethe cross-bar 10. 'The cross-bar passes through a .slot in, the head and it carries the reins of the cutters 11 and 12 as will be presently explained. Thehead 3 carries a depending l expander 01' tongue 13 of lesswidth than that of the headsothat shoulders 14 and 15 are formed to act as stops to limit the slidingmovernent of the cutters [in one direction. Each cutter consists of a cutting headl having 'a curved face 15' to cut away the earth'belovv the bottom of the casmgorfpipe 1 and each cutter is'provideid their upper ends with slots 18 and l9'through which the cross-bar is adapted to pass. The

standing projection,22 in spaced rel ation wlththe projections 20. and 21. fOnonel face of the rectangular [block or member 10 are tvvo grooves or kerfs 23 and 24 to receivethe reins of one of the cutters for example; the

cutter; 11 and on the opposite face/ofthe' rectangular bar or block are similar grooves or ker'fs 25 and 26 to receive the'reins-of the other cutter; for example, the cutter 19.

These kerfs increase in depth fromthe top to. the bottom, from zero thickness toan er fpreciable depth-,sothat the edges oi the {reins will be retained in the grooves or kerfs d1iring the'expanding operation of the cutters as'well as when expanded. The cutters are interchangeablesince they'are duplicates one of the other and their endsoverlaplvilfi shown in Figure 5., The Widths. of the ker fsgjor grooves are substantially Y equal to? the thicknesses of thereins but the edgesot the keris ,or grooves are slightly beveled as indicated at 2'1 to provide a relief so that thereinsvvill Hand in the slot28 of; the headed portions;

as a we easily moveiinto the kerfs or grooves whern ,the'crossebar'is insertedin the slots 18 and v projections and ing the cross-bar'into the slots. The inner faces of the projections 20'and 21 are also slightly beveled as indicated at 31 and 32 to guide the reins into the space between the 21 and the intermediate projection22. V 1 V 1 It will be Observed that the actuating rod 8 'is' provided with an intermediate enlarged portion33'provided with ars'lot 34. This slot is adapted to receive a dent ordrift key 35 (see Fig. 10, Sheet 1) when the cutters arein collapsed position as shown in Figure 2 so that the cutters can be held against ex- Y pandingwhen they are being set in'the casing. Ashearable pin 36 can pass through openings 37 and 38in the cutters 11 and 12 tohold'them collapsed prior tobelng set and in orderto collapse them, they can be 7 held between the hook- shaped members 39 and 40 fast tothe eye 41 on the floor. The head isprovided. with relief ports44 and 45 (see Figure. 3). .I r vWhen it is desired to connect the cutters to the head, the actuating rod will be pulled V r the lower end of thecasing causing the spring down and held against the expansive force ,of the spring by the drift key 35. Then, the 1 reins ofthe cutters can be caused to straddle the head and the'cro-ss bar 10,insertedthr0ugh the -slots-18, 19 and 28 'so that the reins w1ll drop inthe-kerfs'provided to receive them.

The cutters can be retracted and held bythe drift key 35 so that the pin 36 can be inserted. ,Then,,the drift key 35 canbe removed and the underreamer against the bottom of the well will breakthe pin 36, allowing the spring 4 'to impart an upward movement to the actuating rod causing the cutters to ride onlthe expandertongue 13 and move Into expanded and cutting position shown 1n Flgure 3. After the cutting operation has been.

completed, an upward pull on the head will cause thefshoulder's 42 and 43 to contact with to be contracted, permitting the expanded tongue upward relative to the cutters and thereby permit the cutters to retract within the casing soi that the underreamer can be removed.

In Figure 5 I have shown that the reins of the cutters alternately overlap. Thisenables themanufacturer to'standardize the cutters so'that they are interchangeable.

, This is anlimp'ortant feature as it reduces the number'of cutters required around an It 'willflbe apparent that the device is simple in construction, ruggedfand that the cut ters'can be easily assembled and disassernbled with respect to the head or stock.

' It will be apparent from the drawings that the slot 28 is longer than the widthof the crossbar 10 so that there can bevenough play of the cross-bar'inthe slot 28 ,to take theten- 'sion off thesprin'g' i when the shoulders 42 and 43 abut against the stop shoulders ,14 and 15.

What I claim and ters Patent is v V '1. An' underreamer comprising a slotted head, cutters having slotted reins and acrossbar insertable through the slot in the head desire to secure by Letand through the slotted reins, the cross-bar 3. ,An underreamer comprising a. slotted head, cutters having slotted reinsand a crossbar insertable through the slotin the'head and through the slotted reins, the cross-bar having side and edge grooves to receive the edges of the slots in the reins, theside grooves being of progressively increasing depths across the bar. 1 v u 4. An underreamer comprising a slotted head, anexpander tongue depending from the head, cutters having slotted reins straddling the tongue and a cross-bar for'connecting' the reins to the head insertable' through the several slots and provided with staggered groovedportions on its sides, the widths of the grooves-being substantially equal to the thicknesses of thereins. .I v

5., An underreamer comprising a slotted head, an expandertongue depending from the head, cutters having slotted reins straddling the tongue and a cross-bar forconnecting the reins to the head insertable through the several slots and provided with grooved portions substantially equal to the thicknesses ofthe reins, the'edges being beveled outwardly.

6. An underreamer comprising a slotted head having a hollow shank, a spring seated 7 against one end of the hollow portion of the shank, an actuator rod in the shankprojecting below the same and having a spring seat against which the other end "of the spring rests, a slotted portion on the actuator rod normally in the shank .but projectable through the shank to receive'a key to hold the sprlng compressed, a slotted end on the actuator rod,an expander tongue on the head,

cutters havingslotted reins to aline with the slot in theend of the actuator rod and the slot in the-head, and a cross-bar projectable through the several slots, the'c'ross-bar having grooves to receive the edges of the slot-s of thereins." I i.

,7; A cross-barf for underreamerscomprisng a substantially rectangular memberhav ng grooves of progressively increasing depths on opposlte facesf of the member in staggered relation.

on its'side, the widths of the grooves being i 8. A cross-bar for underreamers comprising a substantially rectangular member having grooves of progressively increasing .depthson opposite faces of the'm ember in staggeredrelation, upwardly extending end projections on' theloar andan intermediate projection spaced from therend projections.

9."A-cross-bar for underreamers comprising a substantially rectangular member hav-' ing grooves of progressively increasing,

depths on opposite faces of the member in staggered relation, upwardly extending end projections on the bar and an intermediate projection spaced from the endprojections, the inner faces of the" end projections being 7 beveled outwardly. P

rojection spaced from the end projections,

staggered relation, upwardly extending end projections on the bar and an intermediate the inner faces of theend projections being beveled outwardly, theendsof the bar being i I e beveledto provide pilot; guides for inserting the bar throughaislotor slots. Y

I 11. 'An underreamercomprisinga slotted head, a slotted spring: responsive cutter actuator. carried bythe head, cuttershaving slot;

ted reins arranged'in pairs tostraddle the head; a cross-bar insertable through the sev eral-slots having grooves on its opposite faces to receivetheedges of'the groovesof the reins and a cutter expander tongue over which the cutters ride when actuated by the rod to move their cutting portions outwardly.

12. 'An underreamer comprising a slotted head, a slotted spring responsive actuator cararranged in pairs to straddle the'head, a p

ried by the head, cutters having slotted reins cross-bar insertable through the several slots having grooves 'on 1ts opposite face to receive t theedges of the grooves of the reinssthe slot l l in the actuator being longer than the width of the cross-bar and means for movingthe cutters outwardly into cutting position.

aflix my signature.

In testimony whereof I V FRED SWAN.

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